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| Home > Publications database > Beitrag zur Entwicklung eines Moduls für die Hochtemperatur Brennstoffzelle |
| Book/Report | FZJ-2019-00711 |
; ;
1995
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/21389
Report No.: Juel-3102
Abstract: A main interest in the development of planar solid oxide fuel cells is a decrease of the operation temperatur from 1000 °C to 800 °C. With this temperatur decrease an increase of the specific resistance of the electrolyte goes along. To compensate this increase the thickness of the electrolyte component must be minimized (10-20 $\mu$m) what can be done by using physical vapor deposition (PVD) technologies. This requires a substrat with a sufficient stability. In this work this substrat will be the anode of the SOFC. So first two ways for the fabrication of the Ni-YSZ-anode with a segregated microstructure are presented. With such an optimized structure it is possible to reduce the nickel content in the anode to less than 30 vol-% without reducing the electrical conductivity. One way utilizes the method of uniaxed pressuring from powders with different cornsizes. The use of great YSZ-particles and fine NiO-powder leads to a segregated microstructure in the Ni-YSZ-cermet. The second way applies tape casting for the anode fabrication, where beneath the usual slurry nickelcoated 8YSZ-balls are used. The coating of the balls was done by reduction out of a nickel solution with natriumhypophosphite. On the other hand the PVD-technologies electron beam evaporation and magnetron sputtering are investigated for their application to deposit the electrolyte. The investigations show that the electron beam evaporation using the actual process parmeters is not sufficient to deposit gastight ionconducting coatings. All coatings showed the columnar structure which is not desired in the field of electrolyte deposition. On the contrary the coatings deposited with the magnetron sputtering showed an ionic conductivity insignificant lower than the bulk material. Though the technologie of magnetron sputtering seams to be quite suitable for the fabrication of the electrolyte component in a SOFC.
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